Thermostat Inspection
Thermostat InspectionReference: Thermostat Removal and Installation
^ Check that air bleed valve (1) of thermostat is clean.
^ Check that valve seat (2) is free from foreign matters.
^ Check thermostat valve operation using the following procedures:
a. Immerse thermostat (1) in water, and heat water gradually.
b. Check that valve is operating with the following specifications:
Temperature at which valve starts opening
80 - 84 degrees C (176 - 183 degrees F)
Temperature at which valve becomes fully open
95 degrees C (203 degrees F)
Thermostat valve lift
More than 8 mm (0.3 in) at 95 degrees C (203 degrees F)
If thermostat valve does not open as specified above, or sticks in any position, replace it.
